KR102345852B1 - Adhesive composition, manufacturing method of adhesive, adhesive, adhesive sheet, manufacturing method of adhesive sheet, manufacturing method of display body and display body - Google Patents

Abstract

The present invention relates to an adhesive composition excellent in both step followability and blister resistance, an adhesive agent, an adhesive sheet and a display body, and a method for manufacturing an adhesive agent, an adhesive sheet and a display body excellent in both step followability and blister resistance The task is to provide
In order to solve the said subject, a radically polymerizable component (A), an ionically polymerizable component (B), a visible light-activated radical polymerization initiator (C) activated by visible light, and an ultraviolet-activated ion activated by ultraviolet light It provides an adhesive composition containing a polymerization initiator (D).

Description

Adhesive composition, manufacturing method of the pressure-sensitive adhesive, the pressure-sensitive adhesive, the pressure-sensitive adhesive sheet, the method of manufacturing the pressure-sensitive adhesive sheet, the manufacturing method of the display body and the display body SHEET, MANUFACTURING METHOD OF DISPLAY BODY AND DISPLAY BODY}

The present invention relates to an adhesive composition suitable for bonding a display body constituent member, an adhesive agent, an adhesive sheet, a display body manufactured using them, and a method for producing an adhesive agent, an adhesive bonding sheet and a display body will be.

Various mobile electronic devices such as smartphones and tablet terminals in recent years have a display using a display module having a liquid crystal element, a light emitting diode (LED element), an organic electroluminescence (organic EL) element, and the like. The cases where the display is a touch panel are increasing.

In the above displays, normally, the protection panel is provided in the surface side of a display body module. In accordance with reduction in thickness and weight of electronic equipment, the protection panel has been changed from a conventional glass plate to a plastic plate such as an acrylic plate or a polycarbonate plate.

Here, between a protection panel and a display body module, even when a protection panel deform|transforms by an external force, the space|gap is provided so that the deformed protection panel may not collide with a display body module.

However, when there is an air gap, that is, the air layer as described above, the reflection loss of light due to the refractive index difference between the protective panel and the air layer and the refractive index difference between the air layer and the display module is large, so that the image quality of the display is deteriorated. have.

Then, it is proposed to improve the image quality of a display by filling in the space|gap between a protection panel and a display body module with an adhesive layer. However, on the display module side of the protection panel, the printed layer on the frame frame may exist as a level difference. If the pressure-sensitive adhesive layer does not follow the level difference, the pressure-sensitive adhesive layer floats near the level difference, resulting in light reflection loss. Therefore, step difference followability is calculated|required by the said adhesive layer.

In order to solve the said subject, patent document 1 is an adhesive layer which fills the space|gap between a protection panel and a display body module, The shear storage modulus (G') at 25 degreeC, 1 Hz is 1.0x10 ⁵ The pressure-sensitive adhesive layer of Pa or less and having a gel fraction of 40% or more is disclosed.

In the invention disclosed in Patent Document 1, it is intended to improve the step difference followability by lowering the storage elastic modulus (G') at room temperature in the pressure-sensitive adhesive layer. However, when the storage elastic modulus (G') at room temperature is made low as described above, the storage elastic modulus (G') at high temperature falls more than necessary, and a problem arises under durable conditions. For example, when high-temperature, high-humidity conditions are implemented, a bubble generate|occur|produces in the step|step difference vicinity, or outgas generate|occur|produces from the plastic plate which is a protection panel, and blisters, such as a bubble, a float, and peeling, generate|occur|produce. On the other hand, when the pressure-sensitive adhesive layer is hardened in order to improve blister resistance, the level difference followability is lowered.

Moreover, Patent Document 2 proposes that a radical polymerizable composition and a cationically polymerizable composition are mixed, and the cured state of the pressure-sensitive adhesive is controlled by ultraviolet (UV) rays as an adhesive film having improved step tracking properties. Specifically, a UV lamp with an illuminance of 1 to 10 mW/cm 2 is used to maintain a semi-cured state by the primary crosslinking reaction of the radically polymerizable composition, and when used, a UV lamp with an illuminance of 50 to 150 mW/cm 2 is used. Complete hardening reaction by secondary crosslinking reaction of a cationically polymerizable composition is performed.

Japanese Patent Laid-Open No. 2010-97070 Japanese Patent Publication No. 2015-515527

However, in the invention described in Patent Document 2, since the UV illuminance at the time of primary crosslinking is weak, productivity is low, and not only the radically polymerizable compound but also some cationically polymerizable compounds react at the time of primary crosslinking, and the reaction progresses, and secondary There is a possibility that crosslinking may not proceed sufficiently. Then, sufficient blister resistance is not obtained.

The present invention has been made in view of such actual conditions, and an adhesive composition excellent in both step followability and blister resistance, an adhesive agent, an adhesive sheet and a display body, and an adhesive adhesive excellent in both step followability and blister resistance , An object of the present invention is to provide a method for manufacturing an adhesive sheet and a display body.

In order to achieve the above object, first, the present invention provides a radically polymerizable component (A), an ionically polymerizable component (B), a visible light activated radical polymerization initiator (C) activated by visible light, and It provides an adhesive composition comprising an ultraviolet-activated ionic polymerization initiator (D) activated by (Invention 1).

When the coating film of the adhesive composition according to the invention (Invention 1) is irradiated with visible light, the visible light-activated radical polymerization initiator (C) is activated to generate radicals, and a polymer of the radically polymerizable component (A) is formed. . At this time, since the ionically polymerizable component (B) does not superpose|polymerize, the adhesive agent layer of a semi-hardened state is obtained. This semi-cured adhesive layer is excellent in initial stage difference followability. In addition, when one display body structural member and another display body structural member are bonded together through the said adhesive layer and then irradiated with ultraviolet rays, the UV-activated ionic polymerization initiator (D) is activated to generate ions, and an ionically polymerizable component The polymer of (B) is formed and an adhesive agent layer is hardened|cured, and it becomes an adhesive agent layer after hardening. This post-curing adhesive layer is excellent in step followability and blister resistance under high-temperature, high-humidity conditions.

In the said invention (invention 1), the said radically polymerizable component (A) is at least 1 of the (meth)acryloyl group-containing monomer which has a (meth)acryloyl group in a molecule|numerator, and a vinyl group-containing monomer which has a vinyl group in a molecule|numerator. It is preferred to include the species (invention 2).

In the said invention (invention 1, 2), it is preferable that the said radically polymerizable component (A) contains the urethane oligomer which has a radically polymerizable group (invention 3).

In the said invention (Inventions 1-3), it is preferable that the said ionically polymerizable component (B) contains the compound which has an epoxy group or a glycidyl ether group (Invention 4).

In the said invention (Inventions 1-4), it is preferable that the said adhesive composition is a solvent-free adhesive composition (Invention 5).

Second, the present invention provides a method for producing a pressure-sensitive adhesive, characterized in that by irradiating visible light to the pressure-sensitive adhesive composition (inventions 1 to 5), the radical polymerizable component (A) is polymerized to obtain the pressure-sensitive adhesive Do (Invention 6).

Thirdly, this invention contains the polymer derived from a radically polymerizable component (A), an ionically polymerizable component (B), and an ultraviolet-activated ionic polymerization initiator (D) activated by ultraviolet-ray, The adhesive agent characterized by the above-mentioned provided (Invention 7).

Fourth, the present invention provides an adhesive sheet having an adhesive layer made of the adhesive (invention 7) (invention 8).

In the invention (invention 8), the pressure-sensitive adhesive sheet includes two release sheets, and the pressure-sensitive adhesive layer is sandwiched by the release sheet so as to be in contact with the release surfaces of the two release sheets. ) is preferable (Invention 9).

Fifthly, the present invention is a method for manufacturing an adhesive sheet having an adhesive layer, wherein the adhesive composition (inventions 1 to 5) is coated, and visible light is applied to the coating film of the adhesive composition. By irradiation, the radical polymerizable component (A) is polymerized to provide a method for producing an adhesive sheet, characterized in that it is used as an adhesive layer (Invention 10).

Sixth, the present invention is a display body having one display body structural member, another display body structural member, and a post-curing adhesive layer for adhering the one display body structural member and the other display body structural member to each other. , The post-curing adhesive layer provides a display body characterized in that it consists of a post-curing adhesive agent containing a polymer derived from a radical polymerizable component (A) and a polymer derived from an ion polymerizable component (B) ( Invention 11).

Seventh, this invention produces a laminated body formed by bonding one display body structural member and another display body structural member through the adhesive agent layer of the said adhesive bonding sheet (Invention 8, 9), The said laminated body It provides a method for producing a display body, characterized in that by irradiating ultraviolet light to the pressure-sensitive adhesive layer to polymerize the ionically polymerizable component (B) to form an adhesive layer after curing (Invention 12).

The pressure-sensitive adhesive composition, the pressure-sensitive adhesive, the pressure-sensitive adhesive sheet, and the display according to the present invention are excellent in both step tracking properties and blister resistance.

1 is a cross-sectional view of an adhesive sheet according to an embodiment of the present invention.
2 is a cross-sectional view of a laminate according to an embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described.

[Adhesive composition]

The pressure-sensitive adhesive composition according to the present embodiment (hereinafter may be referred to as "adhesive composition P") is a radically polymerizable component (A), an ionically polymerizable component (B), and a visible light activated by visible light. A light-activated radical polymerization initiator (C) and an ultraviolet-activated ionic polymerization initiator (D) activated by ultraviolet light are contained. Here, an "adhesive agent" means an adhesive agent which shows adhesiveness in an initial state, hardens|cures by triggers, such as ultraviolet irradiation, and shows strong adhesiveness. In addition, the visible light in this specification shall mean the light ray with a wavelength of 380 nm or more and 780 nm or less, and an ultraviolet-ray shall mean the light ray with a wavelength of 10 nm or more and less than 380 nm.

When the coating film of the adhesive composition P is irradiated with visible light, the visible light activated radical polymerization initiator (C) is activated to generate radicals. Thereby, a radically polymerizable component (A) radically polymerizes, and the polymer of a radically polymerizable component (A) is formed in a composition. At this time, since the ionically polymerizable component (B) does not superpose|polymerize, the adhesive agent layer of a semi-hardened state is obtained. Even when this pressure-sensitive adhesive layer in a semi-cured state is affixed to a display body structural member having a step, it is easy to follow the step, and it is suppressed that a gap, a lift, etc. occur in the vicinity of the step. Therefore, the pressure-sensitive adhesive layer formed by the pressure-sensitive adhesive composition P is excellent in the initial step difference followability.

In addition, after bonding one display body structural member and another display body structural member through the said adhesive agent layer, when irradiating an ultraviolet-ray with respect to an adhesive agent layer through one display body structural member or another display body structural member, The ultraviolet-activated ion polymerization initiator (D) activates and generates ions. Thereby, the ionically polymerizable component (B) ionically polymerizes, the polymer of the ionically polymerizable component (B) is formed in an adhesive agent, an adhesive agent layer hardens|cures, and it becomes an adhesive agent layer after hardening. Since the adhesive layer after curing exhibits high cohesive force and strong adhesiveness, even when the obtained laminate (display body) is placed under high temperature and high humidity conditions, for example, 85° C., 85% RH for 72 hours. , generation of bubbles, floating, peeling, etc. in the vicinity of the step is suppressed. Moreover, generation|occurrence|production of blisters, such as a bubble in the interface of a display body structural member and an adhesive agent layer after hardening, floatation, and peeling, is also suppressed. Accordingly, the pressure-sensitive adhesive layer formed by the pressure-sensitive adhesive composition P, and furthermore, the pressure-sensitive adhesive layer after curing is excellent in step followability and blister resistance under high-temperature, high-humidity conditions.

Here, in the adhesive composition P which concerns on this embodiment, a visible light activated radical polymerization initiator (C) and an ultraviolet activated ionic polymerization initiator (D) exist separately. Accordingly, when irradiating visible light to the coating film of the pressure-sensitive adhesive composition P, there is no need to lower the illuminance of visible light, and there is no fear that the ionically polymerizable component (B) is cured by irradiation with visible light. , an ionically polymerizable component (B) fully hardens|cures by ultraviolet irradiation after that, and desired adhesiveness can be obtained. Therefore, according to the adhesive composition P, it is possible to manufacture a display body excellent in step followability and blister resistance with high productivity.

It is preferable that the adhesive composition P which concerns on this embodiment is a solvent-free type adhesive composition, and a solvent-free type becomes possible by having the said composition. If it is a solvent-free adhesive composition, mixing, coating, etc. are possible without using a solvent, and since a solvent volatilization process is unnecessary, a thick adhesive layer can be easily formed.

(1) each component

(1-1) radically polymerizable component (A)

It is preferable that the radically polymerizable component (A) in this embodiment is a component which radically superposes|polymerizes with the radical which generate|occur|produced in the visible-ray-activated radical polymerization initiator (C), and exhibits predetermined|prescribed adhesiveness. The radically polymerizable component (A) preferably contains at least one of a (meth)acryloyl group-containing monomer having a (meth)acryloyl group in the molecule and a vinyl group-containing monomer having a vinyl group in the molecule, and It is also preferable to include a urethane oligomer having a radically polymerizable group (polymerizable urethane oligomer), and in particular, it is preferable to include at least one of a (meth)acryloyl group-containing monomer and a vinyl group-containing monomer, and a polymerizable urethane oligomer. do. Here, a (meth)acryloyl group containing monomer shall not be contained in a vinyl group containing monomer. In addition, in this specification, (meth)acryloyl means both acryloyl and methacryloyl. The same is true for other similar terms.

The (meth)acryloyl group-containing monomer and the vinyl group-containing monomer are preferably used because they undergo radical polymerization and exhibit predetermined adhesiveness. In addition, since the (meth)acryloyl group-containing monomer and the vinyl group-containing monomer have a relatively small molecular weight and low viscosity, by using them, the adhesive composition P does not require a solvent and can be mixed, coated, etc. It can be made into a solvent-free adhesive composition.

As a (meth)acryloyl group containing monomer, a monofunctional (meth)acryloyl group containing monomer may be sufficient, and a polyfunctional (meth)acryloyl group containing monomer may be sufficient. Here, the monofunctional (meth)acryloyl group-containing monomer refers to a monomer having one (meth)acryloyl group in the molecule, and the polyfunctional (meth)acryloyl group-containing monomer refers to the (meth)acryloyl group-containing monomer in the molecule. It refers to a monomer having two or more acryloyl groups. In addition, a (meth)acryloyl group containing monomer may be used individually by 1 type, and may be used in combination of 2 or more type.

As a monofunctional (meth)acryloyl group containing monomer, C1-C20 (meth)acrylic-acid alkylester of an alkyl group is mentioned preferably, for example. Examples of the (meth)acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, pentyl ( Meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, myristyl (meth) Acrylate, palmityl (meth)acrylate, stearyl (meth)acrylate, lauryl (meth)acrylate, etc. are mentioned. Among these, the (meth)acrylic acid alkylester of C1-C8 of an alkyl group is preferable, and 2-ethylhexyl acrylate is especially preferable from a viewpoint of high adhesive force expression with respect to various to-be-adhered bodies.

Moreover, as a monofunctional (meth)acryloyl group containing monomer, the (meth)acrylate (alicyclic structure containing (meth)acrylate) which has an alicyclic structure in a molecule|numerator is also mentioned preferably. Since the alicyclic structure containing (meth)acrylate is bulky and shows hydrophobicity, the adhesiveness with respect to the resin plate of the adhesive agent obtained is improved, and also improves blister resistance.

Examples of the alicyclic structure-containing (meth)acrylate include cyclohexyl (meth)acrylate, dicyclopentanyl (meth)acrylate, adamantyl (meth)acrylate, isobornyl (meth)acrylate, Dicyclopentenyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, etc. are mentioned. Among these, isobornyl acrylate is preferable from a viewpoint of viscosity adjustment of a coating liquid, and radical polymerizability.

The monofunctional (meth)acryloyl group-containing monomer may have a reactive group. Examples of the reactive group include a hydroxyl group, a carboxy group, a thiol group, and a primary or secondary amino group. Examples of the monofunctional (meth)acryloyl group-containing monomer having such a reactive group include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl ( hydroxyalkyl (meth)acrylates such as meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate; hydroxyl group-containing acrylamides such as N-methylolacrylamide and N-methylolmethacrylamide; and ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, and citraconic acid.

Among the above, when hydroxyalkyl (meth)acrylate is used, a predetermined amount of hydroxyl groups will exist in the adhesive agent obtained. The hydroxyl group is a hydrophilic group, and when such a hydrophilic group exists in a predetermined amount in the adhesive, even when the adhesive is placed under high temperature and high humidity conditions, compatibility with moisture that has penetrated into the adhesive under the high temperature and high humidity conditions is good, and as a result, Whitening of the adhesive agent at the time of returning to normal temperature and normal humidity will be suppressed (it is excellent in moisture heat whitening resistance). From this point of view, it is preferable to use hydroxyalkyl (meth)acrylate, and in particular, it is preferable to use hydroxyalkyl (meth)acrylate having a hydroxyalkyl group having 1 to 4 carbon atoms, and 2-hydroxy It is more preferable to use ethyl acrylate.

As a monofunctional (meth)acryloyl group containing monomer, besides the above, For example, For example, Alkoxyalkyl (meth)acrylates, such as methoxyethyl (meth)acrylate and ethoxyethyl (meth)acrylate; polyoxyalkylene-modified (meth)acrylate; nitrile-based monomers such as acrylonitrile and methacrylonitrile; amide-based monomers such as acrylamide, methacrylamide, N-methylacrylamide, N-methylmethacrylamide, N-N-dimethyl(meth)acrylamide, and N-N-diethyl(meth)acrylamide; Tertiary amino group-containing monomers such as (meth)acrylic acid N-N-diethylaminoethyl and N-(meth)acryloylmorpholine can also be used.

As a polyfunctional (meth)acryloyl group containing monomer, the monomer which has two or more (meth)acryloyl groups in one molecule is mentioned preferably. Examples of such a monomer include 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, Neopentyl glycol adipate di (meth) acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone-modified dicyclopentenyl di (meth) acrylate, ethylene Oxide-modified phosphoric acid di(meth)acrylate, di(acryloxyethyl)isocyanurate, allylated cyclohexyldi(meth)acrylate, trimethylolpropane tri(meth)acrylate, dipentaerythritol tri(meth) Acrylate, propionic acid modified dipentaerythritol tri(meth)acrylate, pentaerythritol tri(meth)acrylate, propylene oxide modified trimethylolpropane tri(meth)acrylate, tris(acryloxyethyl)isocyanurate, bis (acryloxyethyl) hydroxyethyl isocyanurate, isocyanuric acid ethylene oxide modified diacrylate, isocyanuric acid ethylene oxide modified triacrylate, ε-caprolactone modified tris(acryloxyethyl) isocyanurate , diglycerin tetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, propionic acid modified dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, caprolactone modified dipentaerythritol hexa (meth) ) acrylates and the like.

Examples of the vinyl group-containing monomer include vinyl esters such as vinyl acetate and vinyl propionate; olefins such as ethylene, propylene, and isobutylene; halogenated olefins such as vinyl chloride and vinylidene chloride; styrene-based monomers such as styrene and α-methylstyrene; diene-based monomers such as butadiene, isoprene and chloroprene; Amide-type monomers, such as N-vinylpyrrolidone, etc. are mentioned. These may be used individually by 1 type, and may be used in combination of 2 or more type.

The polymerizable urethane oligomer is preferably used because it undergoes radical polymerization and exhibits predetermined adhesiveness. In addition, the reactive urethane oligomer is particularly preferably used because there is an advantage that the viscosity of the coating solution can be adjusted to the extent that thick film processing is possible.

It is preferable that it is 3,000 or more, and, as for the polymerization average molecular weight of a polymerizable urethane oligomer, it is especially preferable that it is 5,000 or more, It is more preferable that it is 8,000 or more. Moreover, it is preferable that it is 100,000 or less, and, as for the said weight average molecular weight, it is especially preferable that it is 50,000 or less, and it is more preferable that it is 20,000 or less. In addition, the weight average molecular weight in this specification is the value of standard polystyrene conversion measured by the gel permeation chromatography (GPC) method.

The polymerizable urethane oligomer is preferably polyfunctional, and the polymerizable group of the polymerizable urethane oligomer is preferably present at the terminal, particularly at both terminals. As a kind of the said polymeric group, a (meth)acryloyl group, a vinyl group, etc. are preferable, for example, and a (meth)acryloyl group is especially preferable. That is, it is preferable that a polymerizable urethane oligomer is a polyfunctional (meth)acrylate oligomer, and in other words, it is preferable that it is a urethane acrylate type oligomer. Urethane acrylate oligomers. It can radically polymerize with the above-mentioned (meth)acryloyl group containing monomer or vinyl group containing monomer, and can exhibit preferable adhesiveness.

The urethane acrylate oligomer is, for example, a compound such as polyalkylene polyol, polyether polyol, polyester polyol, hydrogenated isoprene having a hydroxyl group terminal, or hydrogenated butadiene having a hydroxyl group terminal, and polyisocyanate; It can be obtained by esterifying the polyurethane oligomer obtained by reaction with (meth)acrylic acid or a (meth)acrylic acid derivative.

Here, as an example of the polyalkylene polyol used for manufacture of a urethane acrylate type oligomer, polypropylene glycol, polyethylene glycol, polybutylene glycol, polyhexylene glycol, etc. are mentioned, In particular, using polypropylene glycol is desirable. In addition, when the number of functional groups in the obtained urethane acrylate oligomer is 3 or more, glycerin, trimethylolpropane, triethanolamine, pentaerythritol, ethylenediamine, diethylenetriamine, sorbitol, sucrose, etc. are appropriately combined. do.

Moreover, as an example of polyisocyanate, Aliphatic diisocyanate, such as hexamethylene diisocyanate and trimethylene diisocyanate; aromatic diisocyanates such as tolylene diisocyanate, xylylene diisocyanate, and diphenyl diisocyanate; Alicyclic diisocyanate, such as dicyclohexylmethane diisocyanate and isophorone diisocyanate, etc. are mentioned, Among these, it is preferable to use alicyclic diisocyanate, and it is especially preferable to use dicyclohexylmethane diisocyanate. Since the alicyclic structure is bulky and has low polarity, the blister resistance of the adhesive agent obtained becomes more excellent by using the urethane acrylate type oligomer containing the alicyclic structure derived from alicyclic diisocyanate. In addition, by using dicyclohexylmethane diisocyanate, the chemical structure of the obtained urethane acrylate oligomer is similar to the chemical structure of glycidyl ethers preferable as the ionically polymerizable component (B) described later, and compatibility This becomes good. In addition, polyisocyanate is not limited to bifunctionality, A thing more than trifunctional can also be used.

Moreover, as a (meth)acrylic acid derivative, hydroxyalkyl (meth)acrylates, such as 2-hydroxyethyl acrylate and 4-hydroxybutyl acrylate, 2-isocyanatoethyl acrylate, and 2-isocyanatoethyl Methacrylate, 1, 1-bis (acryloxymethyl) ethyl isocyanate, etc. are mentioned, It is especially preferable to use 2-isocyanato ethyl acrylate.

As another method for producing a urethane acrylate-based oligomer, a hydroxyl group and an isocyanatoalkyl ( A urethane acrylate oligomer can also be obtained by reaction between -N=C=O moiety which meth)acrylate has. In this case, as the isocyanatoalkyl (meth)acrylate, the above-mentioned 2-isocyanatoethyl acrylate, 2-isocyanatoethyl methacrylate, 1,1-bis(acryloxymethyl)ethyl isocyanate, etc. can be used

The radically polymerizable component (A) in the present embodiment may contain polyfunctional (meth)acrylate oligomers other than the urethane acrylate oligomer instead of the urethane acrylate oligomer or together with the urethane acrylate oligomer. do. As an example of such an oligomer, oligomers, such as a polyester acrylate type, an epoxy acrylate type, a polyether acrylate type, a polybutadiene acrylate type, a silicone acrylate type, are mentioned.

Polyester acrylate-based oligomer, for example, by esterifying the hydroxyl groups of a polyester oligomer having hydroxyl groups at both terminals obtained by condensation of polyhydric carboxylic acid and polyhydric alcohol with (meth)acrylic acid, or by esterifying polyvalent carboxylic acid with alkylene oxide It can be obtained by esterifying the hydroxyl group at the terminal of the oligomer obtained by adding a seed with (meth)acrylic acid.

The epoxy acrylate oligomer can be obtained by, for example, reacting (meth)acrylic acid with an oxirane ring of a relatively low molecular weight bisphenol-type epoxy resin or novolak-type epoxy resin to esterify it. In addition, a carboxyl-modified epoxy acrylate-based oligomer in which an epoxy acrylate-based oligomer is partially modified with a dibasic carboxylic acid anhydride may be used.

A polyether acrylate type oligomer can be obtained by esterifying the hydroxyl group of polyether polyol with (meth)acrylic acid, for example.

It is preferable that it is 1,000 or more, and, as for the weight average molecular weight of the said polyfunctional (meth)acrylate oligomer, it is especially preferable that it is 5,000 or more. Moreover, it is preferable that the said weight average molecular weight is 100,000 or less, and it is especially preferable that it is 50,000 or less.

The radically polymerizable component (A) in this embodiment has, among the above, (meth)acrylic acid alkylester of C1-C20 of an alkyl group, alicyclic structure containing (meth)acrylate, and a reactive group (meth) ) It is preferable to contain an acryloyl group-containing monomer and a polymerizable urethane oligomer, and in particular, 2-ethylhexyl acrylate, isobornyl acrylate, 2-hydroxyethyl acrylate, and urethane acrylate oligomer It is preferable from a viewpoint of compatibility of various materials to contain.

In this case, as a lower limit, it is preferable that content of (meth)acrylic acid alkylester (especially 2-ethylhexyl acrylate) in a radically polymerizable component (A) is 5 mass % or more, and it is more preferable that it is 10 mass % or more And it is especially preferable that it is 30 mass % or more. Moreover, as an upper limit, it is preferable that it is 70 mass % or less, It is more preferable that it is 60 mass % or less, It is especially preferable that it is 50 mass % or less.

The content of the alicyclic structure-containing (meth)acrylate (especially isobornyl acrylate) in the radically polymerizable component (A) is, as a lower limit, preferably 5 mass% or more, more preferably 10 mass% or more, , it is particularly preferably 15% by mass or more. Moreover, as an upper limit, it is preferable that it is 50 mass % or less, It is more preferable that it is 40 mass % or less, It is especially preferable that it is 30 mass % or less.

As a lower limit, it is preferable that content of the (meth)acryloyl group containing monomer (especially 2-hydroxyethyl acrylate) which has a reactive group in a radically polymerizable component (A) is 2 mass % or more, and 5 mass % It is more preferable that it is more than it, and it is especially preferable that it is 8 mass % or more. Moreover, as an upper limit, it is preferable that it is 40 mass % or less, It is more preferable that it is 30 mass % or less, It is especially preferable that it is 20 mass % or less.

The content of the polymerizable urethane oligomer (especially urethane acrylate oligomer) in the radically polymerizable component (A) is, as a lower limit, preferably 5 mass % or more, more preferably 10 mass % or more, and 20 mass % or more It is particularly preferred. Moreover, as an upper limit, it is preferable that it is 60 mass % or less, It is more preferable that it is 50 mass % or less, It is especially preferable that it is 40 mass % or less.

As a lower limit, it is preferable that content of the radically polymerizable component (A) in adhesive composition P is 70 mass % or more, It is preferable that it is 75 mass % or more, It is more preferable that it is 80 mass % or more. Moreover, as an upper limit, it is preferable that it is 99 mass % or less, It is preferable that it is 97 mass % or less, It is more preferable that it is 95 mass % or less.

(1-2) Ion polymerizable component (B)

It is preferable that the ionically polymerizable component (B) in this embodiment is a component which ionically polymerizes with the ion which the ultraviolet-activated ionic polymerization initiator (D) generate|occur|produced, and exhibits predetermined|prescribed adhesiveness. Although the ionically polymerizable component (B) may be a cationically polymerizable component or an anionically polymerizable component may be sufficient as it, it is preferable from a viewpoint of the diversity of material selection that it is a cationically polymerizable component. An ionically polymerizable component (B) may be used individually by 1 type, and may be used in combination of 2 or more type.

A monomer may be sufficient as a cationically polymerizable component, and a prepolymer may be sufficient as it. As a cationically polymerizable component which is a monomer, For example, alkyl-substituted alkenes, such as indene and coumarone, ethyl vinyl ether, n-butyl vinyl ether, cyclohexyl vinyl ether, butanediol divinyl ether, diethylene glycol divinyl ether, etc. Glycidyl ethers such as vinyl ethers, bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, ethylene glycol diglycidyl ether, and hydrogenated products thereof, 3-ethyl-3-hydroxyethyloxetane , oxetanes such as 1,4-bis[(3-ethyl-3-oxetanylmethoxy)methyl]benzene, 3,4-epoxycyclohexylmethyl(3,4-epoxy)cyclohexanecarboxylate, bis Alicyclic epoxies, such as (3,4-epoxycyclohexyl) adipate, N-vinylcarbazole, etc. are mentioned. Among the above, glycidyl ethers or alicyclic epoxies are preferable from the viewpoint of more accurately performing the two-stage polymerization reaction of radical polymerization and ionic polymerization.

Moreover, as a cationically polymerizable component which is a prepolymer, an epoxy resin, an oxetane resin, vinyl ether resin, etc. are mentioned, for example. Examples of the epoxy resin include a compound obtained by epoxidizing polyhydric phenols such as bisphenol resin and novolac resin with epichlorohydrin, or a compound obtained by oxidizing a linear olefin compound or a cyclic olefin compound with a peroxide or the like. and the like.

Among the above, it is preferable to have an epoxy group or a glycidyl ether group, and it is especially preferable to have an alicyclic structure. Specifically, the above glycidyl ethers are preferable, and in particular, bisphenol A diglycidyl ether and hydrogenated bisphenol A diglycidyl ether are preferable, and hydrogenated bisphenol A diglycidyl ether is more preferable. Since the compound which has an epoxy group or a glycidyl ether group carries out cationic polymerization and exhibits predetermined|prescribed adhesiveness, it is used preferably. Moreover, since the alicyclic structure is bulky and hydrophobic, the adhesive agent obtained becomes the thing excellent in blister resistance by using the cationically polymerizable component which has an alicyclic structure. Moreover, since the diglycidyl ether which has a bisphenol A skeleton is similar to the chemical structure of the urethane acrylate type oligomer obtained using the above-mentioned dicyclohexylmethane diisocyanate, compatibility becomes favorable.

From the above, it is preferable that the radically polymerizable component (A) and the ionically polymerizable component (B) each contain an alicyclic structure.

The content of the ionically polymerizable component (B) in the pressure-sensitive adhesive composition P is preferably 0.1% by mass or more, preferably 0.5% by mass or more, and 1% by mass as a lower limit from the viewpoint of making the level difference followability more excellent. More preferably. On the other hand, as an upper limit, from a viewpoint of exhibiting the performance by a radically polymerizable component (A) more, it is preferable that it is 40 mass % or less, It is more preferable that it is 30 mass % or less, It is more preferable that it is 20 mass % or less.

In addition, the content of the ionically polymerizable component (B) is preferably 1 part by mass or more, preferably 2 parts by mass or more, as a lower limit with respect to 100 parts by mass of the radically polymerizable component (A) from the viewpoint of step followability , more preferably 4 parts by mass or more. On the other hand, as an upper limit, from a viewpoint of exhibiting the performance by a radically polymerizable component (A) more, it is preferable that it is 100 mass parts or less, It is preferable that it is 50 mass parts or less, It is more preferable that it is 15 mass parts or less.

(1-3) Visible light activated radical polymerization initiator (C)

The visible ray-activated radical polymerization initiator (C) in the present embodiment can be activated by irradiation with visible ray to generate radicals, and can polymerize the radically polymerizable component (A) described above. A visible ray activation radical polymerization initiator (C) may be used individually by 1 type, and may be used in combination of 2 or more type.

As such a visible ray activated radical polymerization initiator (C), For example, an acylphosphine oxide type compound; dialkylaminobenzophenone compounds such as 4,4'-bis(diethylamino)benzophenone and 4,4'-bis(N,N'-dimethylamino)benzophenone; metallocenes such as bis(η5-2-4-cyclopentadien-1-yl)bis[2,6-difluoro-3-(1H-pyrrol-1-yl)phenyl]titanium; Camphorquinone etc. are mentioned, Among them, an acylphosphine oxide type compound is preferable from a viewpoint of the solubility to a coating liquid, and a color tone.

Examples of the acylphosphine oxide-based compound include 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, 2,4,6 -trimethylbenzoyl-diphenyl-phosphinate, etc. are mentioned, Among them, 2,4,6-trimethylbenzoyl-di from a viewpoint of solubility in a coating solution and the color (mainly yellow color) of a sheet|seat Phenyl-phosphine oxide is preferred.

Content of the visible light activation radical polymerization initiator (C) in the adhesive composition P is a lower limit with respect to 100 mass parts of radically polymerizable components (A), It is preferable that it is 0.05 mass parts or more, It is preferable that it is 0.1 mass parts or more And, it is more preferable that it is 0.2 mass part or more. On the other hand, as an upper limit, it is preferable that it is 5 mass parts or less, It is preferable that it is 3 mass parts or less, It is more preferable that it is 1.5 mass parts or less.

(1-4) UV-activated ion polymerization initiator (D)

The ultraviolet-activated ion polymerization initiator (D) in this embodiment can be activated by irradiation of an ultraviolet-ray, generate|occur|produce an ion, and can polymerize the ion-polymerizable component (B) mentioned above. An ultraviolet-ray activated ion polymerization initiator (D) may be used individually by 1 type, and may be used in combination of 2 or more type.

Examples of the UV-activated ion polymerization initiator (D) include onium such as aromatic sulfonium ion, aromatic oxosulfonium ion and aromatic iodonium ion, tetrafluoroborate, hexafluorophosphate, hexafluoroanti The compound which consists of anions, such as monate and hexafluoro arsenate, is mentioned. Specifically, iodonium, (4-methylphenyl)[4-(2-methylpropyl)phenyl]-hexafluorophosphate (1-), triarylsulfonium hexafluorophosphate, triarylsulfonium tetrakis- (pentafluorophenyl) borate etc. are mentioned, Among them, from a viewpoint of the solubility to a coating liquid, and a handling property, iodonium, (4-methylphenyl) [4- (2-methylpropyl) phenyl] -hexafluoro Rhophosphate (1-) is preferred.

The content of the ultraviolet-activated ionic polymerization initiator (D) in the pressure-sensitive adhesive composition P is, as a lower limit, 0.5 parts by mass or more, preferably 2 parts by mass or more, with respect to 100 parts by mass of the ionically polymerizable component (B) , more preferably 5 parts by mass or more. On the other hand, as an upper limit, it is preferable that it is 50 mass parts or less, It is preferable that it is 40 mass parts or less, It is more preferable that it is 30 mass parts or less.

(1-5) Various additives

To the adhesive composition P, if desired, various additives, for example, a silane coupling agent, an ultraviolet absorber, an antistatic agent, a tackifier, an antioxidant, a light stabilizer, a softener, a filler, a refractive index modifier, etc. can be added. In addition, the polymerization solvent mentioned later shall not be contained in the additive which comprises the adhesive agent composition P.

Here, when the adhesive composition P contains a silane coupling agent, the adhesive agent obtained will improve adhesiveness with a glass member and a plastic plate. Thereby, the obtained adhesive agent becomes a thing more excellent in step|step difference followability|trackability and blister resistance under high-temperature, high-humidity conditions.

As a silane coupling agent, it is an organosilicon compound which has at least one alkoxysilyl group in a molecule|numerator, Compatibility with each component mentioned above is good, and what has light transmittance is preferable.

As such a silane coupling agent, for example, polymerizable unsaturated group-containing silicon compounds such as vinyltrimethoxysilane, vinyltriethoxysilane, and methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane Silicon compounds having an epoxy structure, such as 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercapto Mercapto group-containing silicon compounds such as propyldimethoxymethylsilane, 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)- An amino group-containing silicon compound such as 3-aminopropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, or at least one thereof, and methyltriethoxysilane, ethyltri Condensates with alkyl group containing silicon compounds, such as ethoxysilane, methyl trimethoxysilane, and ethyl trimethoxysilane, etc. are mentioned. These may be used individually by 1 type, and may be used in combination of 2 or more type.

When adhesive composition P contains a silane coupling agent, the content is 0.01 mass part or more with respect to a total of 100 mass parts of a radically polymerizable component (A) and an ionically polymerizable component (B) (polymerizable component) It is preferable, and it is especially preferable that it is 0.05 mass part or more, and it is more preferable that it is 0.1 mass part or more. Moreover, it is preferable that the said content is 1 mass part or less with respect to a total of 100 mass parts of a polymeric component, It is especially preferable that it is 0.5 mass part or less, It is more preferable that it is 0.3 mass part or less.

(2) Preparation of adhesive composition

The pressure-sensitive adhesive composition P is desired while mixing a radically polymerizable component (A), an ionically polymerizable component (B), a visible light activated radical polymerization initiator (C), and an ultraviolet activated ionic polymerization initiator (D) It can be prepared by adding additives according to the

Here, when a (meth)acryloyl group-containing monomer or a vinyl group-containing monomer is used as the radically polymerizable component (A), since they have a relatively small molecular weight and low viscosity, each component is prepared without requiring a solvent. mixing becomes possible. Such adhesive composition P is a solvent-free adhesive composition, and can be used as a coating liquid as it is.

[Adhesive]

The pressure-sensitive adhesive according to the present embodiment is obtained by irradiating visible light to the pressure-sensitive adhesive composition P (usually a coating film of the pressure-sensitive adhesive composition P) to polymerize the radically polymerizable component (A), and is in a semi-cured state. . Structurally, the adhesive according to the present embodiment is a polymer derived from the radically polymerizable component (A), preferably an acrylic polymer, an ionically polymerizable component (B), and an ultraviolet-activated ionic polymerization initiator activated by ultraviolet rays. (D) contains. Moreover, the adhesive agent which concerns on this embodiment may contain the residue of a visible light activation radical polymerization initiator (C) other than the said component.

The residue of the visible ray activated radical polymerization initiator (C) remains without the visible ray activated radical polymerization initiator (C) contained in the adhesive composition P being cleaved even by visible ray irradiation. Therefore, the content is not much, and is 0.00001 mass % or more and 0.1 mass % or less normally in an adhesive agent, Preferably, they are 0.0001 mass % or more and 0.01 mass % or less.

Irradiation of visible light can be preferably performed by, for example, irradiating light from a high-pressure mercury lamp, a fusion H lamp, or a xenon lamp through an optical filter capable of selecting a wavelength. In this case, the wavelength of the light beam is limited to 380 nm or more, preferably 390 nm or more by means of the wavelength selectable optical filter.

As the above-mentioned wavelength selectable optical filter, for example, a short wavelength cut filter, a band pass filter, a filter for mercury exposure light, an optical substrate having an absorption wavelength of 390 nm or less, for example, a triacetyl cellulose film, polyethylene naphthalate A film, a transparent resin film on which a surface treatment coating absorbing an absorption wavelength of 390 nm or less has been applied, or the like can be used.

It is preferable that illuminance is 5 mW/cm<2> or more, and, as for the irradiation amount of visible light, it is especially preferable that it is 15 mW/cm<2> or more, and it is more preferable that it is 30 mW/cm<2> or more. Moreover, it is preferable that it is 300 mW/cm<2> or less, and, as for illuminance, it is especially preferable that it is 250 mW/cm<2> or less, and it is more preferable that it is 200 mW/cm<2> or less. The amount of light is preferably 200 mJ/cm 2 or more, particularly preferably 300 mJ/cm 2 or more, and more preferably 500 mJ/cm 2 or more. Moreover, it is preferable that it is 5000 mJ/cm<2> or less, and, as for light quantity, it is especially preferable that it is 4000 mJ/cm<2> or less, and it is more preferable that it is 2000 mJ/cm<2> or less.

The pressure-sensitive adhesive according to the present embodiment contains a radically polymerizable component (A), an ionically polymerizable component (B), a visible light activated radical polymerization initiator (C), and an ultraviolet activated ionic polymerization initiator (D). Since the adhesive composition P is irradiated with visible light, only the radically polymerizable component (A) can be radically polymerized without polymerizing the ionically polymerizable component (B), thereby becoming a semi-cured state. In this way, even when the adhesive agent in a semi-cured state is affixed to a display body structural member having a level difference, it is easy to follow the level difference, and it is suppressed that a gap, a lift, etc. occur in the vicinity of the level difference, and it is excellent in the initial step followability.

The gel fraction of the pressure-sensitive adhesive according to the present embodiment is preferably 30% or more, particularly preferably 35% or more, and more preferably 40% or more. Moreover, it is preferable that the said gel fraction is 70 % or less, It is especially preferable that it is 66 % or less, It is more preferable that it is 63 % or less. When the gel fraction of the pressure-sensitive adhesive is within the above range, the initial stage difference followability is more excellent. Here, the measuring method of the gel fraction of an adhesive agent is as showing in the test example mentioned later.

[Adhesive sheet]

The pressure-sensitive adhesive sheet according to the present embodiment has a pressure-sensitive adhesive layer made of the above-described pressure-sensitive adhesive, and preferably has an adhesive layer for bonding one display body constituent member and another display body constituent member, and the An adhesive agent layer consists of the adhesive agent mentioned above.

A specific configuration as an example of the adhesive sheet according to the present embodiment is shown in FIG. 1 . As shown in FIG. 1 , the pressure-sensitive adhesive sheet 1 according to the embodiment includes two release sheets 12a and 12b and the release surfaces of the two release sheets 12a and 12b. It is comprised by the adhesive agent layer 11 pinched|interposed by two release sheets 12a, 12b. In addition, the peeling surface of the peeling sheet in this specification means the surface which has peelability in a peeling sheet, and it includes any of the surface which gave peeling treatment and the surface which shows peelability even if it does not perform peeling processing. .

(1) adhesive layer

The pressure-sensitive adhesive layer 11 is composed of the above-described pressure-sensitive adhesive, that is, the pressure-sensitive adhesive composition P is composed of a pressure-sensitive adhesive formed by semi-curing by irradiation with visible light.

The thickness (value measured based on JIS K7130:1999) of the pressure-sensitive adhesive layer 11 in the pressure-sensitive adhesive sheet 1 according to the present embodiment is preferably 10 µm or more, more preferably 25 µm or more, , It is particularly preferably 50 µm or more, and more preferably 75 µm or more. Moreover, it is preferable that the said thickness is 1000 micrometers or less, It is more preferable that it is 400 micrometers or less, It is especially preferable that it is 300 micrometers or less. In addition, the adhesive agent layer 11 may be formed in a single layer, and may be formed by laminating|stacking multiple layers.

If the thickness of the adhesive layer 11 is 10 micrometers or more, it will become easy to exhibit desired adhesive force. Moreover, workability becomes favorable as the thickness of the adhesive agent layer 11 is 1000 micrometers or less.

In addition, when the above-described adhesive composition P is a solvent-free adhesive composition, since the solvent volatilization step after coating is unnecessary, the adhesive layer 11 of a thick film (preferably 100 μm or more in thickness) can be easily formed can be formed

(2) release sheet

The release sheets 12a and 12b protect the pressure-sensitive adhesive layer 11 until use of the pressure-sensitive adhesive sheet 1, and are peeled off when the pressure-sensitive adhesive sheet 1 (the pressure-sensitive adhesive layer 11) is used. In the pressure-sensitive adhesive sheet 1 according to the present embodiment, one or both of the release sheets 12a and 12b are not necessarily required.

As the release sheets 12a and 12b, for example, a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polymethylpentene film, a polyvinyl chloride film, a vinyl chloride copolymer film, a polyethylene terephthalate film, a polyethylene Naphthalate film, polybutylene terephthalate film, polyurethane film, ethylene acetate vinyl film, ionomer resin film, ethylene/(meth)acrylic acid copolymer film, ethylene/(meth)acrylic acid ester copolymer film, polystyrene film, A polycarbonate film, a polyimide film, a fluororesin film, etc. are used. Moreover, these crosslinked films are also used. Moreover, these laminated|multilayer films may be sufficient.

It is preferable that the peeling process is given to the peeling surface (particularly, the surface in contact with the adhesive agent layer 11) of the said peeling sheet 12a, 12b. As a release agent used for a peeling process, the release agent of an alkyd type, a silicone type, a fluorine type, an unsaturated polyester type, a polyolefin type, and a wax type is mentioned, for example. Moreover, among the release sheets 12a and 12b, one release sheet was used as a heavy release type release sheet with a large peeling force, and the other release sheet was used as a light release type release sheet with a small peel force. It is preferable to do

Although there is no restriction|limiting in particular about the thickness of peeling sheet 12a, 12b, Usually, they are 20 micrometers or more and 150 micrometers or less.

(3) Physical properties (total light transmittance)

The total light transmittance of the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1 according to the present embodiment is preferably 90% or more, particularly preferably 95% or more, and more preferably 98% or more. When the total light transmittance is 90% or more, transparency is very high, and it is suitable as an optical use. In addition, let the total light transmittance in this specification be the value measured based on JISK7361-1:1997.

(4) Manufacture of adhesive sheet

As one manufacturing example of the pressure-sensitive adhesive sheet 1, an application layer is formed by applying the pressure-sensitive adhesive composition P to the release surface of one release sheet 12a (or 12b), and the other release sheet is applied to the application layer. After overlapping the peeling surfaces of (12b) (or 12a), the application layer is irradiated with visible light (and heat-treated) to semi-harden the pressure-sensitive adhesive composition P to form the pressure-sensitive adhesive layer 11 .

As another production example of the pressure-sensitive adhesive sheet 1, the pressure-sensitive adhesive composition P is applied to the release surface of one release sheet 12a (or 12b), and the pressure-sensitive adhesive composition P is irradiated with visible light (and heat-treated). After semi-hardening to form the adhesive layer 11, the peeling surface of the other peeling sheet 12b (or 12a) is overlapped with the adhesive layer 11 on the other side.

As a method of applying the coating liquid of the adhesive composition P, for example, a bar coat method, a knife coat method, a roll coat method, a blade coat method, a die coat method, a gravure coat method, etc. can be used.

In the pressure-sensitive adhesive sheet 1 according to the present embodiment manufactured as described above, since the pressure-sensitive adhesive layer 11 is in a semi-cured state, even when it is affixed to a display body structural member having a level difference, it is easy to follow the level difference, the initial stage has excellent step-difference trackability.

[display body]

As shown in FIG. 2, as for the display body 2 which concerns on this embodiment, the 1st display body structural member 21 (one display body structural member) which has a level|step difference in the surface on the side bonded at least, and 2nd The display body structural member 22 (another display body structural member) and the adhesive agent layer 11 which are located between them and adhere|attachs the 1st display body structural member 21 and the 2nd display body structural member 22 to each other It is constituted by providing In the display body 2 which concerns on this embodiment, the 1st display body structural member 21 has a level difference in the surface by the side of the adhesive agent layer 11, Specifically, the level difference by the printed layer 3 has a

The post-curing adhesive layer 11' in the display body 2 irradiates ultraviolet rays to the adhesive layer 11 of the adhesive sheet 1 described above to polymerize the ionically polymerizable component (B). It is obtained by making it, and it is a thing of a hardened state. This after-hardening adhesive agent layer 11' contains the polymer derived from a radically polymerizable component (A), and the polymer derived from an ionically polymerizable component (B) when it sees structurally. In the adhesive layer 11' after hardening, it is estimated that the polymer derived from an ionically polymerizable component (B) is entangled with the polymer derived from a radically polymerizable component (A). Moreover, the adhesive agent layer 11' after hardening may contain the residue of an ultraviolet-ray-activated ionic polymerization initiator (D), and may also contain the residue of a visible-ray-activated radical polymerization initiator (C).

As for the residue of the ultraviolet-activated ionic polymerization initiator (D), the ultraviolet-activated ionic polymerization initiator (D) contained in the adhesive layer 11 remained without cleavage even by ultraviolet irradiation. Therefore, the content is not much, and is usually 0.00001 mass % or more and 0.1 mass % or less in the adhesive after curing, preferably 0.0001 mass % or more and 0.01 mass % or less. In addition, the residue of the visible ray activated radical polymerization initiator (C) becomes equal to or less than the quantity contained in the adhesive agent layer 11.

As the display body 2, a liquid crystal (LCD) display, a light emitting diode (LED) display, an organic electroluminescent (organic EL) display, electronic paper etc. are mentioned, for example, A touch panel may be sufficient. In addition, as the display body 2, the member which comprises them may be sufficient.

It is preferable that the 1st display body structural member 21 is a protective panel which consists of a laminated body etc. which contain them other than a glass plate, a plastic plate, etc. In this case, it is common that the printing layer 3 is formed in the form of a frame frame in the adhesive agent layer 11 side in the 1st display body structural member 21.

The glass plate is not particularly limited, and for example, chemically strengthened glass, alkali-free glass, quartz glass, soda lime glass, barium strontium-containing glass, aluminosilicate glass, lead glass, borosilicate glass, barium borosilicate glass, etc. can be heard Although the thickness of a glass plate is not specifically limited, Usually, it is 0.1 mm or more, Preferably it is 0.2 mm or more. In addition, the said thickness is 5 mm or less normally, Preferably it is 2 mm or less.

It does not specifically limit as said plastic plate, For example, an acrylic plate, a polycarbonate plate, etc. are mentioned. Although the thickness of a plastic plate is not specifically limited, Usually, it is 0.2 mm or more, Preferably it is 0.4 mm or more. In addition, the said thickness is 5 mm or less normally, Preferably it is 3 mm or less.

In addition, various functional layers (a transparent conductive film, a metal layer, a silica layer, a hard-coat layer, an anti-glare layer, etc.) may be provided on the single side|surface or both surfaces of the said glass plate or a plastic plate, and the optical member may be laminated|stacked. In addition, the transparent conductive film and the metal layer may be patterned.

The 2nd display body structural member 22 is the optical member which should be affixed to the 1st display body structural member 21, a display body module (For example, a liquid crystal (LCD) module, a light emitting diode (LED) module, an organic electro It is preferable that it is a laminated body containing a luminescence (organic EL) module etc., the optical member as a part of a display body module, or a display body module.

Examples of the optical member include an anti-scattering film, a polarizing plate (polarizing film), a polarizer, a retardation plate (retardation film), a viewing angle compensation film, a brightness enhancing film, a contrast enhancing film, a liquid crystal polymer film, a diffusing film, a transflective film A film, a transparent conductive film, etc. are mentioned. As an anti-scattering film, the hard-coat film etc. by which the hard-coat layer is formed in the single side|surface of a base film are illustrated.

The material constituting the printed layer 3 is not particularly limited, and a known material for printing is used. The thickness of the printed layer 3, ie, the lower limit of the height of the step, is preferably 3 µm or more, more preferably 5 µm or more, particularly preferably 7 µm or more, and most preferably 10 µm or more. When a lower limit is more than the said thing, concealability, such as making an electric wiring invisible from a viewer's side, can fully be ensured. Moreover, it is preferable that it is 60 micrometers or less, and, as for an upper limit, it is more preferable that it is 50 micrometers or less, It is especially preferable that it is 40 micrometers or less, It is still more preferable that it is 20 micrometers or less. When the upper limit is equal to or less than the above, it is possible to prevent deterioration of the level difference followability of the adhesive layer 11 ′ after curing with respect to the printed layer 3 .

In order to manufacture the said display body 2, as an example, one peeling sheet 12a of the pressure-sensitive adhesive sheet 1 is peeled, and the exposed pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1 is formed. 1 It is bonded to the surface of the display body structural member 21 on the side where the printed layer 3 exists. At this time, since the adhesive layer 11 is excellent in the followability|trackability of an initial stage difference, it is suppressed that a clearance gap or a lift occurs in the step vicinity by the printed layer 3 .

Next, the other release sheet 12b is peeled off from the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1, and the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1 is exposed and the second display body is constructed. The members 22 are bonded together to obtain a laminate. Moreover, you may change the bonding order of the 1st display body structural member 21 and the 2nd display body structural member 22 as another example.

Then, the ultraviolet-ray is irradiated with respect to the adhesive agent layer 11 in the said laminated body. Thereby, an ultraviolet-ray activated ionic polymerization initiator (D) activates, it generate|occur|produces an ion, and the ionically polymerizable component (B) in the adhesive agent layer 11 superposes|polymerizes with the said ion. In this way, the adhesive layer 11 is cured to become the adhesive layer 11 ′ after curing. Irradiation of the ultraviolet-ray to the adhesive layer 11 is normally performed over either one of the 1st display body structural member 21 or the 2nd display body structural member 22, Preferably, 1st as a protective panel It carries out over the display body structural member 21.

The ultraviolet irradiation can be performed by a high-pressure mercury lamp, a fusion H lamp, a xenon lamp, or the like. It is preferable that illuminance is 20 mW/cm<2> or more, and, as for the irradiation amount of an ultraviolet-ray, it is especially preferable that it is 50 mW/cm<2> or more, and it is more preferable that it is 100 mW/cm<2> or more. Moreover, it is preferable that it is 500 mW/cm<2> or less, and, as for illuminance, it is especially preferable that it is 300 mW/cm<2> or less, and it is more preferable that it is 200 mW/cm<2> or less. The amount of light is preferably 500 mJ/cm 2 or more, particularly preferably 700 mJ/cm 2 or more, and more preferably 1000 mJ/cm 2 or more. Moreover, it is preferable that it is 10000 mJ/cm<2> or less, and, as for the amount of light, it is especially preferable that it is 8000 mJ/cm<2> or less, and it is more preferable that it is 5000 mJ/cm<2> or less.

The gel fraction of the adhesive after curing constituting the adhesive layer 11 ′ after curing is preferably 60% or more, particularly preferably 65% or more, and more preferably 67% or more. Moreover, it is preferable that the said gel fraction is 99 % or less, It is especially preferable that it is 85 % or less, It is more preferable that it is 80 % or less. The above-mentioned gel fraction of the adhesive after curing is higher than the gel fraction of the above-described adhesive (before irradiation with ultraviolet rays), whereby it can be recognized that the ionically polymerizable component (B) is polymerized. When the gel fraction of the pressure-sensitive adhesive after curing is within the above range, it becomes more excellent in step followability and blister resistance under high-temperature, high-humidity conditions. Here, the measuring method of the gel fraction of the adhesive agent after hardening is as showing in the test example mentioned later.

The haze value of the adhesive layer 11' after curing is preferably 2.0% or less, particularly preferably 1.5% or less, and more preferably 1.0% or less. When the haze value of the adhesive layer 11' after curing is 1.0% or less, transparency is high, and it is suitable as an optical use (for display body). In addition, let the haze value in this specification be the value measured based on JISK7136:2000.

In the display body 2 described above, since the adhesive layer 11' after curing exhibits high cohesive force and strong adhesiveness, it is excellent in step followability and blister resistance under high-temperature, high-humidity conditions. Accordingly, even when the display body 2 is placed under high temperature and high humidity conditions (eg, 85°C, 85%RH, 72 hours), it is suppressed that bubbles, floatation, peeling, etc. occur in the vicinity of the level difference. In addition, even when the display body 2 is put under high temperature and high humidity conditions (for example, 85 degreeC, 85%RH, 72 hours) and outgas is generated from the display body structural member which consists of a plastic plate etc., hardening It is suppressed that blisters, such as a bubble, a float, and peeling, generate|occur|produce in the interface between the post-adhesive layer 11' and the display body structural members 21 and 22.

Here, the post-hardening adhesive agent layer 11' in the said display body 2 is formed using the adhesive agent composition P containing hydroxyalkyl (meth)acrylate as a radically polymerizable component (A). When it becomes, after implementing high-temperature, high-humidity conditions to the said display body 2, whitening at the time of returning to normal temperature is suppressed, and it is excellent in moist heat whitening resistance.

After curing, the excellent moisture and heat whitening resistance of the adhesive layer 11' can be evaluated as follows. For example, two transparent conductive film films on both sides of the adhesive layer 11 (a polyethylene terephthalate film provided with a transparent conductive film made of tin-doped indium oxide (ITO) on one side; transparent conductive film on the adhesive layer side) It sandwiches and obtains a laminated body by irradiating an ultraviolet-ray from the at least one side over the said transparent conductive film film. The laminate is stored for 120 hours at 85°C and 85%RH (wet and heat conditions), and then taken out at 23°C and 50%RH at normal temperature and humidity. The value obtained by subtracting the haze value (%) before the wet heat condition from the haze value (%) after the wet heat condition in the laminate (the value measured based on JIS K7136:2000. The same applies hereafter) (the haze value rises after the wet heat condition) to calculate

It is preferable that it is less than 0.50 point, and, as for the haze value rise after a wet heat condition, it is especially preferable that it is less than 0.20 point. Moreover, in the said evaluation, it is preferable to use the thing whose haze value is about 0 % as said alkali free glass. Moreover, it is preferable that it is 2.0 % or less, and, as for the haze value of the adhesive agent layer after the said wet heat condition, it is especially preferable that it is 1.5 % or less, and it is more preferable that it is 1.0 % or less.

The embodiment described above is described in order to facilitate the understanding of the present invention, and is not described in order to limit the present invention. Accordingly, each element disclosed in the above embodiment is intended to include all design changes and equivalents falling within the technical scope of the present invention.

For example, either one or both of the release sheets 12a and 12b in the pressure-sensitive adhesive sheet 1 may be omitted, and a desired optical member is laminated instead of the release sheets 12a and/or 12b may be In addition, the 1st display body structural member 21 may have steps other than the printed layer 3 . Moreover, not only the 1st display body structural member 21 but the 2nd display body structural member 22 may also have a level|step difference in the adhesive agent layer 11 side.

[Example]

Hereinafter, the present invention will be described in more detail with reference to Examples and the like, but the scope of the present invention is not limited to these Examples and the like.

[Example 1]

1. Preparation of urethane acrylate oligomer

1 mole of polypropylene glycol (PPG) having a weight average molecular weight of 9,200, 2 moles of isophorone diisocyanate (IPDI), and 2 moles of 2-hydroxyethyl acrylate (HEA) are polymerized to form a urethane acrylate oligomer by weight Polyether urethane acrylate with an average molecular weight of 9,900 was obtained.

In addition, the weight average molecular weight of polypropylene glycol and polyether urethane acrylate is a standard polystyrene conversion value measured according to the following conditions by gel permeation chromatography (GPC).

· GPC measuring device: Dosoh Corporation, HLC-8020

· GPC column: manufactured by Tosoh Corporation (hereinafter, described in the order of passage)

TSK guard column HXL-H

TSK gel GMHXL (×2)

TSK gel G2000HXL

· Measurement solvent: tetrahydrofuran

· Measurement temperature: 40℃

2. Preparation of adhesive composition

As the (meth)acryloyl group-containing monomer, 40 parts by mass of 2-ethylhexyl acrylate, 20 parts by mass of isobornyl acrylate, and 10 parts by mass of 2-hydroxyethyl acrylate, and the urethane acrylate system prepared in step 1 above. The radically polymerizable component (A) was obtained by mixing and stirring 30 mass parts of polyether urethane acrylates as an oligomer.

100 parts by mass of the obtained radically polymerizable component (A), 30 parts by mass of hydrogenated bisphenol A diglycidyl ether as the ionically polymerizable component (B), and 2,4,6- as a visible light activated radical polymerization initiator (C) 1 part by mass of trimethylbenzoyl-diphenyl-phosphine oxide and iodonium, (4-methylphenyl)[4-(2-methylpropyl)phenyl]-hexafluorophosphate ( 1-) and propylene carbonate in a mass ratio of 3:1 were mixed with 1 mass part of a mixture and 0.2 mass parts of 3-glycidoxypropyltrimethoxysilane as a silane coupling agent, after mixing and stirring, static defoaming, and solvent-free type An adhesive composition was obtained.

3. Preparation of adhesive sheet

The solvent-free pressure-sensitive adhesive composition obtained in step 2 was applied to the release-treated surface of a medium-peelable release sheet (manufactured by Lintex, product name "SP-PET752150"), in which one side of a polyethylene terephthalate film was peeled off with a silicone-based release agent, and applied with a knife coater. .

Next, the application layer on the medium release type release sheet obtained above, and the light release type release sheet (manufactured by Lintex, product name "SP-PET382120") in which one side of the polyethylene terephthalate film was peeled off with a silicone release agent was prepared by applying the light release type release sheet It was bonded so that the peeling-processed surface of the contact|coating layer might be contacted.

Then, visible light (wavelength 390 nm or more) was irradiated to the application layer through a heavy release type release sheet under the following conditions, and only the radically polymerizable component (A) was selectively polymerized. Thereby, the pressure-sensitive adhesive sheet which consists of a heavy peeling type release sheet/pressure-sensitive adhesive layer (thickness: 100 µm)/light release type release sheet was obtained. In addition, irradiation of visible light was performed by irradiating the light beam of a high-pressure mercury-vapor lamp over the triacetyl cellulose film (80 micrometers in thickness) which selectively transmits the light beam of wavelength 390 nm or more.

<Visible light irradiation conditions>

Light source: high pressure mercury lamp

Optical filter: 80㎛ triacetyl cellulose film

Illuminance: 100mW/cm2

Accumulated light intensity: 2000mJ/cm2

・UV illuminance and light meter use “UVPF-A1” manufactured by Eye Graphics.

[Example 2]

Except changing the compounding quantity of an ionically polymerizable component (B) into 5 mass parts, it carried out similarly to Example 1, and produced the adhesive bonding sheet|seat.

[Comparative Example 1]

Except not mix|blending an ionically polymerizable component (B) and an ultraviolet-activated ionic polymerization initiator (D), it carried out similarly to Example 1, and produced the adhesive bonding sheet|seat.

[Comparative Example 2]

In the same manner as in Example 1, except that 15 parts by mass of polybutadiene (manufactured by Nippon Soda Co., Ltd., product name "GI-1000") hydrogenated at both ends in place of the ion-polymerizable component (B) and the ultraviolet-activated ionic polymerization initiator (D) was blended. Thus, an adhesive sheet was produced.

[Test Example 1] (Measurement of gel fraction)

Cut the adhesive sheet obtained in Examples and Comparative Examples to a size of 80 mm × 80 mm, wrap the adhesive layer in a polyester mesh (mesh size 200), and weigh the mass with a precision balance, and the mesh alone By subtracting the mass, the mass of only the adhesive agent was computed. Let the mass at this time be M1.

Next, the adhesive wrapped in the polyester mesh was immersed in ethyl acetate at room temperature (23° C.) for 72 hours. After that, the adhesive was taken out and air-dried for 24 hours in an environment of a temperature of 23°C and a relative humidity of 50%, and further dried in an oven at 80°C for 12 hours. After drying, the mass was measured with a precision balance, and the mass of only the adhesive agent was computed by subtracting the mass of the said mesh independent. Let the mass at this time be M2. The gel fraction (%) is expressed as (M2/M1) x 100. Thereby, the gel fraction (after visible light irradiation) of the adhesive agent was derived. A result is shown in Table 1.

On the other hand, with respect to the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet obtained in Examples and Comparative Examples, over the light-peelable release sheet, by irradiating ultraviolet light under the following conditions to polymerize the ionically polymerizable component (B), and further curing the pressure-sensitive adhesive layer After curing, it was made into an adhesive layer. About the adhesive agent of this post-hardening adhesive agent layer, it carried out similarly to the above, and the gel fraction (after ultraviolet irradiation) was derived. A result is shown in Table 1.

<Ultraviolet irradiation conditions>

Light source: high pressure mercury lamp

Illuminance: 200mW/cm2

Accumulated light intensity: 4000mJ/cm2

・UV illuminance and light meter use “UVPF-A1” manufactured by Eye Graphics.

[Test Example 2] (Measurement of total light transmittance)

The light-peelable release sheet was peeled off from the adhesive bonding sheet obtained by the Example and the comparative example, and the exposed adhesive agent layer was bonded together to 1.1 mm-thick soda-lime glass (made by Nippon Sheet Glass). Next, under the same conditions as in Test Example 1, ultraviolet rays were irradiated through the heavy release type release sheet to cure the pressure-sensitive adhesive layer to form a post-curing pressure-sensitive adhesive layer, and then the heavy release type release sheet was peeled off, and this was used as a measurement sample. After performing background measurement with soda-lime glass, the total light transmittance (%) of the sample for measurement using a haze meter (manufactured by Nippon Denshoku Kogyo Co., Ltd., product name "NDH-2000") in accordance with JIS K7361-1:1997. ) was measured. A result is shown in Table 1.

[Test Example 3] (Evaluation of step difference followability)

UV curable ink (manufactured by Teikoku Ink, product name “POS-911 Sumi”) on the surface of a glass plate (NSG Freshjohn Corporation, product name “Corning Glass Eagle XG”, length 90 mm × width 50 mm × thickness 0.5 mm) on the frame frame (Appearance: 90 mm long x 50 mm wide, 5 mm wide) and screen-printed. Then, by irradiating UV rays (80W/cm2, metal halide lamp 2 lights, lamp height 15cm, belt speed 10-15 m/min), the printed UV curable ink is cured, and the step difference by printing (step height: 40) μm) was prepared.

A polyethylene terephthalate film (manufactured by Toyobo Corporation, product name "PET A4300", thickness: 100 µm) of the easily adhesive layer. Next, the medium release type release sheet is peeled to expose the pressure-sensitive adhesive layer, and using a laminator (manufactured by Fujipla Co., product name "LPD3214"), the step-imparting glass plate so that the pressure-sensitive adhesive layer covers the entire printing surface on the frame edge. laminated on. Then, the autoclave process was carried out for 30 minutes under the conditions of 50 degreeC, 0.5 MPa, and it left to stand at normal pressure, 23 degreeC, 50%RH for 24 hours.

About the adhesive layer of the obtained laminated body, ultraviolet-ray was irradiated over the said polyethylene terephthalate film under the same conditions as Test Example 1, the adhesive layer was hardened, and it was set as the adhesive agent layer after hardening. Then, it is stored for 72 hours under high-temperature and high-humidity conditions of 85°C and 85%RH (durability test). Followability was evaluated. A result is shown in Table 2.

○: There is no bubble (floating, peeling) near the step, and the adhesive is following without a gap.

(triangle|delta): Bubbles are mixed in a part of step|step difference vicinity.

x: Bubbles are mixed in the whole periphery of a level|step difference.

[Test Example 4] (Evaluation of blister resistance)

The adhesive layer of the adhesive sheet obtained in Examples and Comparative Examples was coated with a polyethylene terephthalate film (manufactured by Oike Kogyo Co., Ltd., ITO film, thickness: 125 μm) provided with a transparent conductive film made of tin-doped indium oxide (ITO) on one side. To the surface of the polycarbonate layer side of a resin plate (manufactured by Mitsubishi Gas Chemicals, product name "Eupiron Sheet MR-58U", thickness: 0.8 mm) having a transparent conductive film, a polymethyl methacrylate layer, and a polycarbonate layer sandwiched between Then, the autoclave process was carried out for 30 minutes under the conditions of 50 degreeC, 0.5 MPa, and it left to stand at normal pressure, 23 degreeC, 50%RH for 24 hours.

About the adhesive agent layer of the obtained laminated body, ultraviolet-ray was irradiated over the said resin plate on the conditions similar to Test Example 1, the adhesive agent layer was hardened, and it was set as the adhesive agent layer after hardening. Then, it stored under 85 degreeC and 85 %RH high-temperature, high-humidity conditions for 72 hours. Then, the state in the interface of the adhesive agent layer and to-be-adhered body after hardening was visually confirmed, and blister resistance was evaluated according to the following criteria. A result is shown in Table 2.

○: Neither air bubbles nor floating and peeling were observed.

(triangle|delta): Although foam|bubble is confirmed in part, floating and peeling is not recognized.

×: Bubbles or floating and peeling are confirmed on the entire surface.

[Test Example 5] (Evaluation of wet heat and whitening resistance)

A polyethylene terephthalate film (manufactured by Oike Kogyo Co., Ltd., product name "ITO film", thickness: 125) on which a transparent conductive film made of tin-doped indium oxide (ITO) is provided on one side of the adhesive layer of the adhesive sheet obtained in Examples or Comparative Examples μm), and sandwiched between two sheets to obtain a laminate. At this time, the surface in which the transparent conductive film of the said film was provided was affixed to the adhesive agent layer. After autoclaving the obtained laminated body on the conditions of 50 degreeC and 0.5 MPa for 30 minutes, it was left to stand at normal pressure, 23 degreeC, 50 %RH for 24 hours. Then, the haze value (%) was measured based on JISK7136:2000 using the haze meter (The Nippon Denshoku Kogyo Co., Ltd. make, product name "NDH2000").

Next, with respect to the adhesive layer of the laminate, ultraviolet rays were irradiated over the film under the same conditions as in Test Example 1, and the adhesive layer was cured to obtain an adhesive layer after curing. Next, this laminate was stored for 120 hours under moist heat conditions of 85°C and 85%RH (durability test). Then, it returned to normal temperature and humidity of 23 degreeC and 50 %RH, and the haze value (%) was measured again about the said laminated body. In addition, the said haze value was measured within 30 minutes after returning a laminated body to normal temperature and normal humidity.

The increase value (point) of the haze value (%) after the said endurance test from the haze value (%) before the said endurance test was computed. Each result is shown in Table 2.

[Table 1]

[Table 2]

As can be seen from Table 2, the pressure-sensitive adhesive sheet obtained in the Example was excellent in step difference followability and blister resistance, and was also excellent in optical properties and wet heat whitening resistance.

The adhesive composition of this invention, an adhesive agent, and an adhesive bonding sheet can be used suitably for bonding of the protective panel which has a level|step difference, and a desired display body structural member, for example.

One … adhesive sheet
11 … adhesive layer
12a, 12b... release sheet
2 … display body
11' … Adhesive layer after curing
21 … 1st display body structural member
22 … 2nd display body structural member
3 … print layer

Claims (12)

A radically polymerizable component (A);
An ionically polymerizable component (B);
A visible light activated radical polymerization initiator (C) activated by visible light;
UV-activated ion polymerization initiator (D) activated by UV light
contains,
The radically polymerizable component (A) contains a urethane oligomer having a radically polymerizable group
Adhesive composition, characterized in that. According to claim 1,
The radically polymerizable component (A) contains at least one kind of a (meth)acryloyl group-containing monomer having a (meth)acryloyl group in the molecule and a vinyl group-containing monomer having a vinyl group in the molecule. adhesive composition. delete According to claim 1,
The said ionically polymerizable component (B) contains the compound which has an epoxy group or a glycidyl ether group, The adhesive agent composition characterized by the above-mentioned. According to claim 1,
Adhesive composition, characterized in that the adhesive composition is a solvent-free adhesive composition. By irradiating visible light to the pressure-sensitive adhesive composition according to claim 1, 2, 4 or 5, the radically polymerizable component (A) is polymerized to obtain the pressure-sensitive adhesive. manufacturing method. A polymer derived from the radically polymerizable component (A) comprising a urethane oligomer having a radically polymerizable group;
An ionically polymerizable component (B);
UV-activated ion polymerization initiator (D) activated by UV light
Adhesive, characterized in that it contains. A pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive according to claim 7. 9. The method of claim 8,
The pressure-sensitive adhesive sheet is provided with two release sheets,
The pressure-sensitive adhesive layer is sandwiched by the release sheet so as to be in contact with the release surfaces of the two release sheets.
Adhesive sheet, characterized in that. As a method of manufacturing an adhesive sheet having an adhesive layer,
Coating the adhesive composition according to claim 1, 2, 4 or 5,
By irradiating visible light to the coating film of the adhesive composition, the radical polymerizable component (A) is polymerized to form an adhesive layer
Method for producing an adhesive sheet, characterized in that. One display body component,
and other display body constituent members;
A post-curing adhesive layer for adhering the one display body constituent member and the other display body constituent member to each other
As a manufacturing method of a display body provided with,
By irradiating a visible light to the layer of the adhesive composition containing the radically polymerizable component (A) containing the urethane oligomer which has a radically polymerizable group, and the ionically polymerizable component (B), the said radically polymerizable component (A) ) to form a polymer derived from the radically polymerizable component (A), which is used as an adhesive layer,
The said one display body structural member and the said other display body structural member are mutually bonded through the said adhesive agent layer,
Next, the adhesive layer is irradiated with ultraviolet rays to polymerize the ionically polymerizable component (B) to form a polymer derived from the ionically polymerizable component (B), which is then cured as an adhesive layer
A method of manufacturing a display body, characterized in that. A laminate formed by bonding one display body structural member and another display body structural member through the adhesive agent layer of the adhesive bonding sheet of Claim 8 or 9 is produced,
By irradiating ultraviolet rays to the adhesive layer of the laminate, the ionically polymerizable component (B) is polymerized to form an adhesive layer after curing
A method for manufacturing a display body, characterized in that.

Images